1、 February 2007DEUTSCHE NORMDIN-Normenausschuss Lichttechnik (FNL)DIN-SprachendienstEnglish price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale f
2、or German Standards (DIN-Normen).ICS 91.160.10!%Adn“2306575www.din.deDDIN 5034-6Daylight in interiors Part 6: Simplified determination of suitable dimensions for rooflights,English translation of DIN 5034-6:2007-02Tageslicht in Innenrumen Teil 6: Vereinfachte Bestimmung zweckmiger Abmessungen von Ob
3、erlichtffnungen inDachflchen,Englische bersetzung von DIN 5034-6:2007-02Lumire naturelle lintrieur Partie 6: Dtermination simplifie de dimension convenable de lucarnes,Traduction anglaise de DIN 5034-6:2007-02SupersedesDIN 5034-6:1995-06www.beuth.deDocument comprises 13 pages11.15 DIN 5034-6:2007-02
4、 2 A comma is used as the decimal marker. Contents Page Foreword . 3 Introduction 4 1 Scope . 4 2 Normative references . 4 3 Symbols . 5 4 Daylight factor . 6 5 Simplified assumptions . 7 5.1 Obstructions 7 5.2 Transmittance . 7 5.3 Reduction factor for frames, sash bars, etc. . 7 5.4 Dirt 8 5.5 Ref
5、lectance of internal room surfaces . 9 6 Calculation of auxiliary parameters 9 6.1 Effect of rooflight wells 9 6.2 Effect of the shape of rooflights 10 6.3 Effect of finite room dimensions . 10 7 Calculation of the necessary rooflight rough opening area 12 Bibliography . 13 Figures Figure 1 Schemati
6、c overview for the explanation of uniformities g1and g26 Figure 2 Reduction factor keto account for the effects of the light well at different angles of inclination Wand a reflectance of the well walls of S= 0,55 in relation to the well index w 8 Figure 3 Overview of the geometric parameters of a ro
7、oflight well . 10 Figure 4 Corrections a and b to account for the finite room length a and width b in relation to angles aand b, which are given by the ratio of one-half the room length or width to the distance between the working plane and the ceiling 11 Figure 5 Example showing the dimensions nece
8、ssary for determining corrections for finite room lengths and widths . 11 Tables Table 1 Relation between reduction factor k2 and dirt load on the glazing (guidance values) according to DIN 5034-3 . 8 Table 2 Reduction factor k4to account for the shape of rooflights . 10 DIN 5034-6:2007-02 3 Forewor
9、d This standard has been prepared by the Normenausschuss Lichttechnik (FNL) (Lighting Technology Standards Committee). DIN 5034 consists of the following parts under the general title Daylight in interiors: Part 1: General requirements Part 2: Principles Part 3: Calculation Part 4: Simplified method
10、 of determining window sizes in dwellings Part 5: Measurement Part 6: Simplified determination of suitable dimensions for rooflights Amendments This standard differs from DIN 5034-6:1995-06 as follows: a) errors in Equations (5), (7), (16) and Figure 3 have been corrected. b) specifications have bee
11、n revised and brought up-to-date with current developments (e.g. the withdrawal of DIN 5035-1 and DIN 5035-2 and replacement/partial replacement by DIN EN 12464-1 and DIN EN 12665). Previous editions DIN 5034-6: 1995-06 DIN 5034-6:2007-02 4 Introduction Rooflights have been used in flat or slightly
12、sloping roofs for many years to illuminate especially large spaces with daylight. At present, no photometric or physiological-optical requirements on the size of rooflights and their distribution in the roof or ceiling are known. However, the many years of experience in the use of rooflights especia
13、lly in rooms with great depths allow statements to be made regarding the effective dimensioning and arrangement of rooflights. This standard describes a suitable calculation method for this purpose. NOTE The term “rooflight” includes, for example, different types of individual rooflights, continuous
14、 rooflights, and shed lights, including those in sawtooth roofs. 1 Scope This standard is intended to allow a fast, approximate sizing of the appropriate ratio of transparent surfaces to the total ceiling space in rooms with rooflights. The numerous parameters influencing the dimensioning of rooflig
15、hts are largely eliminated by specifying representative default values in Clause 5, making a comparison of various rooflight shapes possible and allowing the approximation of roof constructions that is often sufficient in practice. DIN 5034-3 describes a method for the precise calculation of illumin
16、ation provided by daylight in rooms with rooflights. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includin
17、g any amendments) applies. DIN 5034-3, Daylight in interiors Part 3: Calculation DIN 18032-1, Sports halls Halls and rooms for sports and multi-purpose use Part 1: Planning principles DIN V 18599-4, Energy efficiency of buildings Calculation of the net, final and primary energy demand for heating, c
18、ooling, ventilation, domestic hot water and lighting Part 4: Net and final energy demand for lighting DIN EN 410, Glass in building Determination of luminous and solar characteristics of glazing DIN EN 12464-1, Light and lighting Lighting of work places Part 1: Indoor work places DIN EN 12665, Light
19、 and lighting Basic terms and criteria for specifying lighting requirements DIN 5034-6:2007-02 5 3 Symbols AOL,iarea of i rooflight rough openings =niAA1iOL,OLsum of the areas of rooflight rough openings a room length aOLclear length of rooflight rough opening aSclear length of rooflight well b room
20、 width bOLclear width of rooflight rough opening bSclear width of rooflight well D daylight factor Daverage daylight factor DHsky component of the daylight factor Dmaxmaximum value for the daylight factor Dminminimum value for the daylight factor OLDaverage daylight factor for rooms with rooflights
21、according to practical experience DRinternally reflected component of the daylight factor Eaoutside horizontal illuminance by an overcast sky without obstructions mE maintained illuminance according to DIN EN 12464-1 g1uniformity of the illumination with daylight; DDgmin1= g2uniformity of the illumi
22、nation with daylight; maxmin2DDg = h clear height of room hNheight above the working plane (see Figure 3) hSheight of rooflight well k1reduction factor for frames, sash bars, etc. k2reduction factor for dirt accumulation k3reduction factor for light incidence that is not normal to the surface k4redu
23、ction factor for shape of rooflights kereduction factor for geometry of the rooflight well n number of rooflights w well index Fangle of inclination of the transparent area to the horizontal Wangle of inclination of the wall of the rooflight well to the horizontal a reduction factor to take account
24、of a finite room length b reduction factor to take account of a finite room width aangle given by the ratio of half the room length to the distance between the working plane and the ceiling DIN 5034-6:2007-02 6 bangle given by the ratio of half the room width to the distance between the working plan
25、e and the ceiling Breflectance of the floor Dreflectance of the ceiling Sreflectance of the sides of the rooflight well Wreflectance of the room walls D65light transmittance for standard illuminant D65 for vertical light incidence according to DIN EN 410 4 Daylight factor The average daylight factor
26、 for the working plane of D 4 % based on a grid of about 2 m should always be strived for. If a room is daylit only by rooflights, it appears dark and depressing when the minimum daylight factor is Dmin 2 %. Figure 1 Schematic overview for the explanation of uniformities g1and g2However, thermal com
27、fort can be adversely affected by solar radiation at high daylight factors. This is particularly true for rooms with low ceilings. In terms of rooflights, the room climate is usually tolerable without additional ventilation systems, even in the middle of summer, if the average daylight factor is D 1
28、0 %. NOTE Regarding the shielding of rooflights from direct sunlight and the effects of glare and/or heat radiation, see the Annexes to 1 and 2. DIN EN 12464-1 specifies certain maintained illuminances mE for artificial lighting in workplaces with different room utilizations and activities. Experien
29、ce has shown that it is expedient to select a daylight factor OLD for rooms with rooflights so that the maintained illuminance for each activity is related to a specific horizontal illuminance from an overcast sky Eaof 5 000 lx. %100lx0005mOL=ED (1) Thus, for mE = 200 lx: OLD = 4 % DIN 5034-6:2007-0
30、2 7 and for mE = 500 lx: OLD = 10 %. In daylit rooms exclusively illuminated by rooflights, the uniformity of the illumination on the working plane (always for illumination from a uniformly overcast sky) should be DDgmin1= (2) at least 1:2 (see Figure 1). NOTE When using rooflights especially in bri
31、ghtly decorated rooms it is often noted after construction that the uniformity maxmin2DDg = (3) is significantly greater, namely at least 1:1,5, if the centre distance between each rooflight is at most as great as the height of the rooflight lower edges above the floor. Diffusing glazing can be used
32、 to achieve a satisfactory uniformity and to minimize glare, even when the room is illuminated by the sun with a clear sky, except in the case of north-facing rooflights which the sun hardly reaches, such as in sawtooth roofs. It is recommended that in the case of continuous rooflights the width bOL
33、should not be greater than half the room height. 5 Simplified assumptions 5.1 Obstructions Any existing obstructions (e.g. buildings, trees, mountains) are to be disregarded; the daylight factor is thus the sum of only the sky component DHand the internally reflected component DR: D = DH+ DR(4) 5.2
34、Transmittance The transmittance D65 of the transparent material shall be stated by the manufacturer. To take into account the reflectance loss due to light incidence from varying directions by illumination from an overcast sky, the transmittance is to be multiplied by the factor k3= 0,85. 5.3 Reduct
35、ion factor for frames, sash bars, etc. The reduction factor for frames, sash bars, etc. k1is given by Equation (5). opening rough of Areaelements ansparentrt-non of Area1opening rough of Areaelements ttransparen of Area1-=k (5) For individual rooflights and ridge rooflights, the area of the construc
36、tion elements such as frames shall be their projected area in the plane of the rough opening. Construction elements that are below the rooflights and which reduce the incidence of light are to be taken into consideration in the same manner. If during the design phase, the value for k1 is unknown, th
37、en k1= 0,9 shall be used. DIN 5034-6:2007-02 8 5.4 Dirt If during the design phase, the value for the reduction factor for dirt accumulation k2 is not yet known, then k2= 0,8 shall be used. However, if guidance values for expected dirt load on the outside and inside of the rooflights are available d
38、uring the design phase, then values for k2can be taken from Table 1. Table 1 Relation between reduction factor k2 and dirt load on the glazing (guidance values) according to DIN 5034-3 Dirt load on k2external surfaces internal surfaces low low medium heavy 0,9 0,8 0,7 medium low medium heavy 0,8 0,7
39、5 0,7 heavy low medium heavy 0,7 0,6 0,5 Figure 2 Reduction factor keto account for the effects of the light well at different angles of inclination Wand a reflectance of the well walls of S= 0,55 in relation to the well index w DIN 5034-6:2007-02 9 5.5 Reflectance of internal room surfaces Values f
40、or the mean reflectance of internal room surfaces are generally not yet known during the design phase. In general, after completion of the building reflectance values are lower than estimated due to additional installations, furniture, etc. If there are no guidance values, the following apply: Mean
41、reflectance of floors: B= 0,15 ceilings: D= 0,55 rooflight wells: S= 0,55 walls: W= 0,35 NOTE Guidance values for the reflectance of coloured surfaces and commonly used building materials are given in DIN 18032-1, for example. 6 Calculation of auxiliary parameters 6.1 Effect of rooflight wells To de
42、termine the reduction factor for the rooflight well ke, first determine the well index w: w = 0,5 +WSSSWSSStan2tan2 /hbh/hha(6) where aSand bSare the length and width, respectively, of the rooflight well at the height at which the light impinges, hSis the height of the rooflight well, and W is the s
43、lope of the well walls. Using reflectance Sof the rooflight wall and its slope W, Equation (7) gives for ke: ke= (0,01 (90 - w) + 0,1)(l-S)w= (0,01 (90 - w) + 0,1)0,45w(7) Figure 2 shows the relation of keto w for several angles of inclination of the well walls, for a rooflight well reflectance of S
44、= 0,55. DIN 5034-6:2007-02 10 Key aOL*)clear length of rooflight rough opening asclear length of rooflight well bOL*) clear width of rooflight rough opening bsclear width of rooflight well hsheight of rooflight well wangle of inclination of the wall of the rooflight well to the horizontal Figure 3 O
45、verview of the geometric parameters of a rooflight well Figure 3, which is taken from DIN V 18599-4, shows the geometric parameters of a rooflight well that determine the well index w. 6.2 Effect of the shape of rooflights Table 2 Reduction factor k4to account for the shape of rooflights Shape k4Inf
46、luencing factors Ridge roof cosF keslope, rooflight well 60 shed rooflight 0,63 shadowing of parts of the sky 90 shed rooflight 0,38 shadowing of parts of the sky Domes kerooflight well 6.3 Effect of finite room dimensions Instead of the clear room height h, take the height hNabove the working plane
47、 at a height of 0,85 m (for sports halls: 1,00 m) above the floor to determine the corrections for the finite room length and width, aand b, respectively. hN= h - 0,85 m (8) *) Translators note. In the figure itself these dimensions are given as a01and b01, respectively. This is incorrect and should
48、 read as given in the key. DIN 5034-6:2007-02 11 Room length a, room width b and height hNgive the angles aand bin (degrees): N2arctanah=a (9) N2arctanbhb= (10) Figure 4 Corrections a and b to account for the finite room length a and width b in relation to angles aand b, which are given by the ratio
49、 of one-half the room length or width to the distance between the working plane and the ceiling Figure 5 Example showing the dimensions necessary for determining corrections for finite room lengths and widths DIN 5034-6:2007-02 12 a and b can be calculated thus: )2(sin74sin7318078aaaa += (11) )2(sin74sin7318078bbbb
